check in v3.8.1 source
This commit is contained in:
88
crypto/cmac/cm_ameth.c
Normal file
88
crypto/cmac/cm_ameth.c
Normal file
@@ -0,0 +1,88 @@
|
||||
/* $OpenBSD: cm_ameth.c,v 1.10 2022/11/26 16:08:51 tb Exp $ */
|
||||
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
|
||||
* project 2010.
|
||||
*/
|
||||
/* ====================================================================
|
||||
* Copyright (c) 2010 The OpenSSL Project. All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
*
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
||||
* distribution.
|
||||
*
|
||||
* 3. All advertising materials mentioning features or use of this
|
||||
* software must display the following acknowledgment:
|
||||
* "This product includes software developed by the OpenSSL Project
|
||||
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
|
||||
*
|
||||
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
|
||||
* endorse or promote products derived from this software without
|
||||
* prior written permission. For written permission, please contact
|
||||
* licensing@OpenSSL.org.
|
||||
*
|
||||
* 5. Products derived from this software may not be called "OpenSSL"
|
||||
* nor may "OpenSSL" appear in their names without prior written
|
||||
* permission of the OpenSSL Project.
|
||||
*
|
||||
* 6. Redistributions of any form whatsoever must retain the following
|
||||
* acknowledgment:
|
||||
* "This product includes software developed by the OpenSSL Project
|
||||
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
|
||||
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
||||
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
|
||||
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
||||
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
||||
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||||
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
||||
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
* ====================================================================
|
||||
*/
|
||||
|
||||
#include <stdio.h>
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#include <openssl/cmac.h>
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#include <openssl/evp.h>
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#include "asn1_local.h"
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#include "evp_local.h"
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|
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/* CMAC "ASN1" method. This is just here to indicate the
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* maximum CMAC output length and to free up a CMAC
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||||
* key.
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*/
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static int
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cmac_size(const EVP_PKEY *pkey)
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{
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return EVP_MAX_BLOCK_LENGTH;
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}
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static void
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cmac_key_free(EVP_PKEY *pkey)
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{
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CMAC_CTX_free(pkey->pkey.ptr);
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}
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const EVP_PKEY_ASN1_METHOD cmac_asn1_meth = {
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.pkey_id = EVP_PKEY_CMAC,
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.pkey_base_id = EVP_PKEY_CMAC,
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.pem_str = "CMAC",
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.info = "OpenSSL CMAC method",
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.pkey_size = cmac_size,
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.pkey_free = cmac_key_free
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};
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212
crypto/cmac/cm_pmeth.c
Normal file
212
crypto/cmac/cm_pmeth.c
Normal file
@@ -0,0 +1,212 @@
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/* $OpenBSD: cm_pmeth.c,v 1.10 2022/11/26 16:08:51 tb Exp $ */
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/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
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||||
* project 2010.
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||||
*/
|
||||
/* ====================================================================
|
||||
* Copyright (c) 2010 The OpenSSL Project. All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
*
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
||||
* distribution.
|
||||
*
|
||||
* 3. All advertising materials mentioning features or use of this
|
||||
* software must display the following acknowledgment:
|
||||
* "This product includes software developed by the OpenSSL Project
|
||||
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
|
||||
*
|
||||
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
|
||||
* endorse or promote products derived from this software without
|
||||
* prior written permission. For written permission, please contact
|
||||
* licensing@OpenSSL.org.
|
||||
*
|
||||
* 5. Products derived from this software may not be called "OpenSSL"
|
||||
* nor may "OpenSSL" appear in their names without prior written
|
||||
* permission of the OpenSSL Project.
|
||||
*
|
||||
* 6. Redistributions of any form whatsoever must retain the following
|
||||
* acknowledgment:
|
||||
* "This product includes software developed by the OpenSSL Project
|
||||
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
|
||||
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
||||
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
|
||||
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
||||
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
||||
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||||
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
||||
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
* ====================================================================
|
||||
*/
|
||||
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||||
#include <stdio.h>
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#include <string.h>
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#include <openssl/cmac.h>
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#include <openssl/evp.h>
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||||
#include <openssl/x509.h>
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||||
#include <openssl/x509v3.h>
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||||
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#include "evp_local.h"
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||||
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||||
/* The context structure and "key" is simply a CMAC_CTX */
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||||
static int
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||||
pkey_cmac_init(EVP_PKEY_CTX *ctx)
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||||
{
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||||
ctx->data = CMAC_CTX_new();
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||||
if (!ctx->data)
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||||
return 0;
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||||
ctx->keygen_info_count = 0;
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||||
return 1;
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||||
}
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||||
static int
|
||||
pkey_cmac_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
|
||||
{
|
||||
if (!pkey_cmac_init(dst))
|
||||
return 0;
|
||||
if (!CMAC_CTX_copy(dst->data, src->data))
|
||||
return 0;
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||||
return 1;
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||||
}
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||||
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static void
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pkey_cmac_cleanup(EVP_PKEY_CTX *ctx)
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||||
{
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||||
CMAC_CTX_free(ctx->data);
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||||
}
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||||
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||||
static int
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||||
pkey_cmac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
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||||
{
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CMAC_CTX *cmkey = CMAC_CTX_new();
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CMAC_CTX *cmctx = ctx->data;
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||||
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||||
if (!cmkey)
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return 0;
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||||
if (!CMAC_CTX_copy(cmkey, cmctx)) {
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CMAC_CTX_free(cmkey);
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return 0;
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||||
}
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EVP_PKEY_assign(pkey, EVP_PKEY_CMAC, cmkey);
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||||
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return 1;
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}
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||||
static int
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||||
int_update(EVP_MD_CTX *ctx, const void *data, size_t count)
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||||
{
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||||
if (!CMAC_Update(ctx->pctx->data, data, count))
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||||
return 0;
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||||
return 1;
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||||
}
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||||
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||||
static int
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||||
cmac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
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||||
{
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EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT);
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mctx->update = int_update;
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return 1;
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||||
}
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static int
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||||
cmac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
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||||
EVP_MD_CTX *mctx)
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||||
{
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||||
return CMAC_Final(ctx->data, sig, siglen);
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||||
}
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||||
|
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static int
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pkey_cmac_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
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||||
{
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CMAC_CTX *cmctx = ctx->data;
|
||||
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switch (type) {
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||||
case EVP_PKEY_CTRL_SET_MAC_KEY:
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if (!p2 || p1 < 0)
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return 0;
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||||
if (!CMAC_Init(cmctx, p2, p1, NULL, NULL))
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return 0;
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break;
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case EVP_PKEY_CTRL_CIPHER:
|
||||
if (!CMAC_Init(cmctx, NULL, 0, p2, ctx->engine))
|
||||
return 0;
|
||||
break;
|
||||
|
||||
case EVP_PKEY_CTRL_MD:
|
||||
if (ctx->pkey && !CMAC_CTX_copy(ctx->data, ctx->pkey->pkey.ptr))
|
||||
return 0;
|
||||
if (!CMAC_Init(cmctx, NULL, 0, NULL, NULL))
|
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return 0;
|
||||
break;
|
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|
||||
default:
|
||||
return -2;
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
|
||||
static int
|
||||
pkey_cmac_ctrl_str(EVP_PKEY_CTX *ctx, const char *type, const char *value)
|
||||
{
|
||||
if (!value)
|
||||
return 0;
|
||||
if (!strcmp(type, "key")) {
|
||||
void *p = (void *)value;
|
||||
return pkey_cmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY,
|
||||
strlen(p), p);
|
||||
}
|
||||
if (!strcmp(type, "cipher")) {
|
||||
const EVP_CIPHER *c;
|
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|
||||
c = EVP_get_cipherbyname(value);
|
||||
if (!c)
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||||
return 0;
|
||||
return pkey_cmac_ctrl(ctx, EVP_PKEY_CTRL_CIPHER, -1, (void *)c);
|
||||
}
|
||||
if (!strcmp(type, "hexkey")) {
|
||||
unsigned char *key;
|
||||
int r;
|
||||
long keylen;
|
||||
|
||||
key = string_to_hex(value, &keylen);
|
||||
if (!key)
|
||||
return 0;
|
||||
r = pkey_cmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, keylen, key);
|
||||
free(key);
|
||||
return r;
|
||||
}
|
||||
|
||||
return -2;
|
||||
}
|
||||
|
||||
const EVP_PKEY_METHOD cmac_pkey_meth = {
|
||||
.pkey_id = EVP_PKEY_CMAC,
|
||||
.flags = EVP_PKEY_FLAG_SIGCTX_CUSTOM,
|
||||
|
||||
.init = pkey_cmac_init,
|
||||
.copy = pkey_cmac_copy,
|
||||
.cleanup = pkey_cmac_cleanup,
|
||||
|
||||
.keygen = pkey_cmac_keygen,
|
||||
|
||||
.signctx_init = cmac_signctx_init,
|
||||
.signctx = cmac_signctx,
|
||||
|
||||
.ctrl = pkey_cmac_ctrl,
|
||||
.ctrl_str = pkey_cmac_ctrl_str
|
||||
};
|
||||
292
crypto/cmac/cmac.c
Normal file
292
crypto/cmac/cmac.c
Normal file
@@ -0,0 +1,292 @@
|
||||
/* $OpenBSD: cmac.c,v 1.14 2023/07/08 14:27:14 beck Exp $ */
|
||||
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
|
||||
* project.
|
||||
*/
|
||||
/* ====================================================================
|
||||
* Copyright (c) 2010 The OpenSSL Project. All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
*
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
||||
* distribution.
|
||||
*
|
||||
* 3. All advertising materials mentioning features or use of this
|
||||
* software must display the following acknowledgment:
|
||||
* "This product includes software developed by the OpenSSL Project
|
||||
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
|
||||
*
|
||||
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
|
||||
* endorse or promote products derived from this software without
|
||||
* prior written permission. For written permission, please contact
|
||||
* licensing@OpenSSL.org.
|
||||
*
|
||||
* 5. Products derived from this software may not be called "OpenSSL"
|
||||
* nor may "OpenSSL" appear in their names without prior written
|
||||
* permission of the OpenSSL Project.
|
||||
*
|
||||
* 6. Redistributions of any form whatsoever must retain the following
|
||||
* acknowledgment:
|
||||
* "This product includes software developed by the OpenSSL Project
|
||||
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
|
||||
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
||||
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
|
||||
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
||||
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
||||
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||||
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
||||
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
* ====================================================================
|
||||
*/
|
||||
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
|
||||
#include <openssl/cmac.h>
|
||||
|
||||
#include "evp_local.h"
|
||||
|
||||
struct CMAC_CTX_st {
|
||||
/* Cipher context to use */
|
||||
EVP_CIPHER_CTX cctx;
|
||||
/* Keys k1 and k2 */
|
||||
unsigned char k1[EVP_MAX_BLOCK_LENGTH];
|
||||
unsigned char k2[EVP_MAX_BLOCK_LENGTH];
|
||||
/* Temporary block */
|
||||
unsigned char tbl[EVP_MAX_BLOCK_LENGTH];
|
||||
/* Last (possibly partial) block */
|
||||
unsigned char last_block[EVP_MAX_BLOCK_LENGTH];
|
||||
/* Number of bytes in last block: -1 means context not initialised */
|
||||
int nlast_block;
|
||||
};
|
||||
|
||||
|
||||
/* Make temporary keys K1 and K2 */
|
||||
|
||||
static void
|
||||
make_kn(unsigned char *k1, unsigned char *l, int bl)
|
||||
{
|
||||
int i;
|
||||
|
||||
/* Shift block to left, including carry */
|
||||
for (i = 0; i < bl; i++) {
|
||||
k1[i] = l[i] << 1;
|
||||
if (i < bl - 1 && l[i + 1] & 0x80)
|
||||
k1[i] |= 1;
|
||||
}
|
||||
/* If MSB set fixup with R */
|
||||
if (l[0] & 0x80)
|
||||
k1[bl - 1] ^= bl == 16 ? 0x87 : 0x1b;
|
||||
}
|
||||
|
||||
CMAC_CTX *
|
||||
CMAC_CTX_new(void)
|
||||
{
|
||||
CMAC_CTX *ctx;
|
||||
|
||||
ctx = malloc(sizeof(CMAC_CTX));
|
||||
if (!ctx)
|
||||
return NULL;
|
||||
EVP_CIPHER_CTX_init(&ctx->cctx);
|
||||
ctx->nlast_block = -1;
|
||||
return ctx;
|
||||
}
|
||||
LCRYPTO_ALIAS(CMAC_CTX_new);
|
||||
|
||||
void
|
||||
CMAC_CTX_cleanup(CMAC_CTX *ctx)
|
||||
{
|
||||
EVP_CIPHER_CTX_cleanup(&ctx->cctx);
|
||||
explicit_bzero(ctx->tbl, EVP_MAX_BLOCK_LENGTH);
|
||||
explicit_bzero(ctx->k1, EVP_MAX_BLOCK_LENGTH);
|
||||
explicit_bzero(ctx->k2, EVP_MAX_BLOCK_LENGTH);
|
||||
explicit_bzero(ctx->last_block, EVP_MAX_BLOCK_LENGTH);
|
||||
ctx->nlast_block = -1;
|
||||
}
|
||||
LCRYPTO_ALIAS(CMAC_CTX_cleanup);
|
||||
|
||||
EVP_CIPHER_CTX *
|
||||
CMAC_CTX_get0_cipher_ctx(CMAC_CTX *ctx)
|
||||
{
|
||||
return &ctx->cctx;
|
||||
}
|
||||
LCRYPTO_ALIAS(CMAC_CTX_get0_cipher_ctx);
|
||||
|
||||
void
|
||||
CMAC_CTX_free(CMAC_CTX *ctx)
|
||||
{
|
||||
if (ctx == NULL)
|
||||
return;
|
||||
|
||||
CMAC_CTX_cleanup(ctx);
|
||||
free(ctx);
|
||||
}
|
||||
LCRYPTO_ALIAS(CMAC_CTX_free);
|
||||
|
||||
int
|
||||
CMAC_CTX_copy(CMAC_CTX *out, const CMAC_CTX *in)
|
||||
{
|
||||
int bl;
|
||||
|
||||
if (in->nlast_block == -1)
|
||||
return 0;
|
||||
if (!EVP_CIPHER_CTX_copy(&out->cctx, &in->cctx))
|
||||
return 0;
|
||||
bl = EVP_CIPHER_CTX_block_size(&in->cctx);
|
||||
memcpy(out->k1, in->k1, bl);
|
||||
memcpy(out->k2, in->k2, bl);
|
||||
memcpy(out->tbl, in->tbl, bl);
|
||||
memcpy(out->last_block, in->last_block, bl);
|
||||
out->nlast_block = in->nlast_block;
|
||||
return 1;
|
||||
}
|
||||
LCRYPTO_ALIAS(CMAC_CTX_copy);
|
||||
|
||||
int
|
||||
CMAC_Init(CMAC_CTX *ctx, const void *key, size_t keylen,
|
||||
const EVP_CIPHER *cipher, ENGINE *impl)
|
||||
{
|
||||
static unsigned char zero_iv[EVP_MAX_BLOCK_LENGTH];
|
||||
|
||||
/* All zeros means restart */
|
||||
if (!key && !cipher && !impl && keylen == 0) {
|
||||
/* Not initialised */
|
||||
if (ctx->nlast_block == -1)
|
||||
return 0;
|
||||
if (!EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, zero_iv))
|
||||
return 0;
|
||||
memset(ctx->tbl, 0, EVP_CIPHER_CTX_block_size(&ctx->cctx));
|
||||
ctx->nlast_block = 0;
|
||||
return 1;
|
||||
}
|
||||
/* Initialise context */
|
||||
if (cipher && !EVP_EncryptInit_ex(&ctx->cctx, cipher, impl, NULL, NULL))
|
||||
return 0;
|
||||
/* Non-NULL key means initialisation complete */
|
||||
if (key) {
|
||||
int bl;
|
||||
|
||||
if (!EVP_CIPHER_CTX_cipher(&ctx->cctx))
|
||||
return 0;
|
||||
if (!EVP_CIPHER_CTX_set_key_length(&ctx->cctx, keylen))
|
||||
return 0;
|
||||
if (!EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, key, zero_iv))
|
||||
return 0;
|
||||
bl = EVP_CIPHER_CTX_block_size(&ctx->cctx);
|
||||
if (!EVP_Cipher(&ctx->cctx, ctx->tbl, zero_iv, bl))
|
||||
return 0;
|
||||
make_kn(ctx->k1, ctx->tbl, bl);
|
||||
make_kn(ctx->k2, ctx->k1, bl);
|
||||
explicit_bzero(ctx->tbl, bl);
|
||||
/* Reset context again ready for first data block */
|
||||
if (!EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, zero_iv))
|
||||
return 0;
|
||||
/* Zero tbl so resume works */
|
||||
memset(ctx->tbl, 0, bl);
|
||||
ctx->nlast_block = 0;
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
LCRYPTO_ALIAS(CMAC_Init);
|
||||
|
||||
int
|
||||
CMAC_Update(CMAC_CTX *ctx, const void *in, size_t dlen)
|
||||
{
|
||||
const unsigned char *data = in;
|
||||
size_t bl;
|
||||
|
||||
if (ctx->nlast_block == -1)
|
||||
return 0;
|
||||
if (dlen == 0)
|
||||
return 1;
|
||||
bl = EVP_CIPHER_CTX_block_size(&ctx->cctx);
|
||||
/* Copy into partial block if we need to */
|
||||
if (ctx->nlast_block > 0) {
|
||||
size_t nleft;
|
||||
|
||||
nleft = bl - ctx->nlast_block;
|
||||
if (dlen < nleft)
|
||||
nleft = dlen;
|
||||
memcpy(ctx->last_block + ctx->nlast_block, data, nleft);
|
||||
dlen -= nleft;
|
||||
ctx->nlast_block += nleft;
|
||||
/* If no more to process return */
|
||||
if (dlen == 0)
|
||||
return 1;
|
||||
data += nleft;
|
||||
/* Else not final block so encrypt it */
|
||||
if (!EVP_Cipher(&ctx->cctx, ctx->tbl, ctx->last_block, bl))
|
||||
return 0;
|
||||
}
|
||||
/* Encrypt all but one of the complete blocks left */
|
||||
while (dlen > bl) {
|
||||
if (!EVP_Cipher(&ctx->cctx, ctx->tbl, data, bl))
|
||||
return 0;
|
||||
dlen -= bl;
|
||||
data += bl;
|
||||
}
|
||||
/* Copy any data left to last block buffer */
|
||||
memcpy(ctx->last_block, data, dlen);
|
||||
ctx->nlast_block = dlen;
|
||||
return 1;
|
||||
}
|
||||
LCRYPTO_ALIAS(CMAC_Update);
|
||||
|
||||
int
|
||||
CMAC_Final(CMAC_CTX *ctx, unsigned char *out, size_t *poutlen)
|
||||
{
|
||||
int i, bl, lb;
|
||||
|
||||
if (ctx->nlast_block == -1)
|
||||
return 0;
|
||||
bl = EVP_CIPHER_CTX_block_size(&ctx->cctx);
|
||||
*poutlen = (size_t)bl;
|
||||
if (!out)
|
||||
return 1;
|
||||
lb = ctx->nlast_block;
|
||||
/* Is last block complete? */
|
||||
if (lb == bl) {
|
||||
for (i = 0; i < bl; i++)
|
||||
out[i] = ctx->last_block[i] ^ ctx->k1[i];
|
||||
} else {
|
||||
ctx->last_block[lb] = 0x80;
|
||||
if (bl - lb > 1)
|
||||
memset(ctx->last_block + lb + 1, 0, bl - lb - 1);
|
||||
for (i = 0; i < bl; i++)
|
||||
out[i] = ctx->last_block[i] ^ ctx->k2[i];
|
||||
}
|
||||
if (!EVP_Cipher(&ctx->cctx, out, out, bl)) {
|
||||
explicit_bzero(out, bl);
|
||||
return 0;
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
LCRYPTO_ALIAS(CMAC_Final);
|
||||
|
||||
int
|
||||
CMAC_resume(CMAC_CTX *ctx)
|
||||
{
|
||||
if (ctx->nlast_block == -1)
|
||||
return 0;
|
||||
/* The buffer "tbl" containes the last fully encrypted block
|
||||
* which is the last IV (or all zeroes if no last encrypted block).
|
||||
* The last block has not been modified since CMAC_final().
|
||||
* So reinitialising using the last decrypted block will allow
|
||||
* CMAC to continue after calling CMAC_Final().
|
||||
*/
|
||||
return EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, ctx->tbl);
|
||||
}
|
||||
LCRYPTO_ALIAS(CMAC_resume);
|
||||
Reference in New Issue
Block a user